Sound Attenuation - Main Duct to Branches

Sound attenuation for main ducts to branches.

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When main ducts are split into branches the sound power level - L_w - is reduced according the size of the branch, or amount of air to the branch.

sound allowance lw split main duct branch

The attenuation can be calculated as

dL_w = 10 log(A_b/A_m) (1)

where

dL_w = attenuation (dB)

A_b = branch area (m², ft²)

A_m = main duct area (m², ft²)

The attenuation is indicated in the diagram below:

sound allowance

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Related Topics

Acoustics Room acoustics, acoustic properties - decibel A, B and C - Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity, attenuation and more ..
Noise and Attenuation Noise is usually defined as unwanted sound - noise, noise generation, silencers and attenuation in HVAC systems

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